FANUC CNC systems are widely used in industrial automation, but users may encounter various alarms and configuration issues during operation.
In this guide, we cover common FANUC CNC problems such as EX107 alarm, DC LINK voltage issues, and 4th axis configuration, along with practical solutions.
With over 30 years of experience, REACO CNC provides professional support, spare parts, and repair services for FANUC CNC systems worldwide.
Frequently Asked Questions (FAQ)
1. What parameters need to be modified when adding a 4th axis to FANUC 0i-MF?
When adding a 4th axis, the following parameters need to be configured:
-
Axis name and servo axis number
-
Rotation axis attributes
-
Limit parameters
-
Speed and acceleration/deceleration parameters
Additional setup includes:
-
FSSB configuration and servo initialization
-
Flexible gear ratio (N/M) and reference counter capacity calculation
-
Reference point setting
-
Advanced system functions such as HRV control, feedforward, and high-speed/high-precision machining
2. What HMI development tools are available for FANUC CNC?
Common FANUC HMI development tools include:
-
FANUC PICTURE
-
C language executor
-
Macro executor
Among them, FANUC PICTURE is especially suitable for developing user-friendly operator interfaces.
3. How to resolve FANUC EX107 alarm?
EX1072 indicates a chip conveyor motor overload, which is a machine manufacturer-defined alarm.
Possible causes include:
-
Mechanical blockage
-
Motor failure
-
Overload protection triggered
Solutions:
-
Clean accumulated chips manually
-
Reset the alarm
-
Identify and eliminate overload causes
If the alarm persists, contact the machine manufacturer for further support.
4. Why does F45.7 signal drop during tool change?
F45.7 is the spindle orientation completion signal.
If the signal drops briefly during tool change, possible reasons include:
-
Mechanical interference causing orientation deviation
-
Incorrect spindle orientation angle
Recommended actions:
-
Recheck and adjust spindle orientation angle
-
If safe, slightly increase parameter P4075 (or P4226 for sub-spindle)
⚠️ Be cautious when adjusting parameters to avoid tool collision or mechanical damage.
5. What does “DC LINK voltage low” alarm mean?
If the system displays DC LINK voltage low (Axis), it usually indicates a servo drive issue.
Troubleshooting steps:
-
Swap with a similar drive to confirm the fault
-
Check power supply condition
-
Replace the faulty drive if necessary
6. How to disable hard limit parameters in FANUC CNC?
Parameter:
-
3004#5 (OTH) controls overtravel signal detection
Settings:
-
0 = Enable (recommended)
-
1 = Disable
⚠️ Warning: For safety reasons, it is strongly recommended to keep this parameter enabled.
7. What to do if the chip conveyor motor overheats?
Steps to resolve:
-
Remove accumulated metal chips
-
Reset the alarm
If the problem continues:
-
Contact the machine manufacturer for inspection
8. How to resolve DS0144 / DS0147 CNC lock alarms?
These alarms indicate that the machine has reached its usage limit and is now locked.
Effects:
-
CNC automatic operation is disabled
Solution:
-
Contact the machine supplier or manufacturer
-
Extend or renew the usage/license period
Reference Source: Beijing FANUC. This article is based on technical documentation provided by Beijing FANUC.
For More Fanuc CNC repair Cases and technical articles, please back to Fanuc Technical Support Center.
Related Articles
Here are some related technical resources you may also find helpful:
- Common FANUC CNC Alarms Classification
- FANUC Common Over Travel Alarm List
- FANUC G/ M Code for a Machining Center
- FANUC G/ M Code for lathe
- How to backup SRAM file
- How to backup All data
- How to Solve FANUC alarm 5523/5524
Technical Categories
Browse our full set of technical resources:
- Common FANUC Alarms
- G & M Code Reference
- Technical Guides (Backup, Parameters, Settings)
- Repair Cases & Troubleshooting Examples
Back to Previous Page
Click here to return to the previous category page.
Back to Technical Support Home
Return to the Technical Support main page to explore all resources.
